Outsource custom GUI class components to dashgui library

Move reusable GUI primitives (PanelTile, EditablePanelTile, base Tile,
ElevatedPill, SingleLineTextEdit) into the shared dashgui package and
consume them via a file: dependency. EditablePanelTile now accepts an
onError prop so error notification stays app-side.

src/components/article/boxes/ArticleViewName.jsx

@@ -1,11 +1,12 @@
 import { Component, PureComponent } from 'react';
-import { EditablePanelTile } from '../../panels';
-import SingleLineTextEdit from '../../SingleLineTextEdit';
+import { EditablePanelTile } from 'dashgui/panels';
+import SingleLineTextEdit from 'dashgui/SingleLineTextEdit';
 import { StorageManagerContext } from '../../../api/storageManagerContext';
 import { getCategoryBreadcrumbs } from '../../../store/categorySlice';
 import { Box, Chip, IconButton } from '@mui/material';
 import AddIcon from '@mui/icons-material/Add';
 import CategoryPickerDialog from '../CategoryPickerDialog';
+import { notifyError } from '../../../utils/notify';
 
 const articleNameTextSx = {
   fontWeight: 700,
@@ -288,6 +289,7 @@ export default class ArticleViewName extends PureComponent {
         color="#ffffff"
         value={value}
         onSave={this.handleSave}
+        onError={notifyError}
         isDirty={() => draft != null && draftDirty(draft, value)}
         canSave={() => draft != null && draftValid(draft)}
         display={